The Bloodhound is a large breed of dog bred specifically to track human beings. Originally used for hunting deer and wild boar, it was created about AD 1000 by the monks of the St. Hubert Monastery in Belgium. Consequently, one of its other names is the St. Hubert Hound. It is a scenthound, tracking by smell, as opposed to a sighthound, which tracks using vision. It is famed for its ability to discern human odors even days later, over great distances, even across water. Its extraordinarily keen sense of smell is combined with a strong and tenacious tracking instinct, producing the ideal scent hound, and it is used by police and law enforcement all over the world to track escaped prisoners, missing people, lost children and lost pets. Bloodhounds weigh from 33 to 50 kg (80 to 110 lbs), though some individuals weigh as much as 72 kg (160 lb). They stand 58 to 69 cm (23 to 27 inches) high at the withers. Bloodhounds have a typical lifespan of about 9 to 11 years. Bloodhounds possess an unusually large skeletal structure with most of their weight concentrated in their bones, which are very thick for their length. The coat typical for a scenthound is hard and composed of fur alone, with no admixture of hair.